$ urlRouterProvider.rule在$ stateChangeStart

Question

我正在使用angular-ui-route v0.3.1。

开展Angularjs SPA

最近应用了rule()以允许不区分大小写的网址...

    $urlRouterProvider.rule(function ($injector, $location) {
        //what this function returns will be set as the $location.url
        var path = $location.path(), normalized = path.toLowerCase();
        if (path != normalized) {
            //instead of returning a new url string, I'll just change the $location.path directly so I don't have to worry about constructing a new url string and so a new state change is not triggered
            $location.replace().path(normalized);
        }
        // because we've returned nothing, no state change occurs
    });

我也在监听$stateChangeStart事件以检查用户是否未登录并将其重定向到登录页面

 $rootScope.$on('$stateChangeStart', function (event, toState, toParams, fromState, fromParams) {
                if (!('data' in toState) || !('access' in toState.data)) {
                    messageHandler.show({
                        message: 'Access undefined for this state',
                        messageType: messageHandler.messageTypes.error
                    });
                    event.preventDefault();
                }
                else
                    if (!auth.authorize(toState.data.access)) {
                        event.preventDefault();// this line cause my circular issue

                        if (!auth.isLoggedIn()) {
                            var redirectState = toState.name;
                            auth.login( redirectState);
                        }
                        else {

                            messageHandler.show({
                                message: 'Seems like you tried accessing a route you do not have access to : ' + toState.name,
                                messageType: messageHandler.messageTypes.warning
                            });
                            $state.go('unauthorized');
                        }
                    }

            });

问题是角色过滤器会对网址进行规范化，在$stateChangeStart事件中执行 event.preventDefault（）时，规范化网址为被取消并再次发生循环。

任何帮助将不胜感激。